CN102271020A - OLT (Optical Line Terminal) link module and passive optical network - Google Patents
OLT (Optical Line Terminal) link module and passive optical network Download PDFInfo
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- CN102271020A CN102271020A CN2011102090314A CN201110209031A CN102271020A CN 102271020 A CN102271020 A CN 102271020A CN 2011102090314 A CN2011102090314 A CN 2011102090314A CN 201110209031 A CN201110209031 A CN 201110209031A CN 102271020 A CN102271020 A CN 102271020A
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Abstract
The invention discloses an OLT (Optical Line Terminal) link module, and aims to provide the OLT link module with less consumption. The OLT link module comprises an OLT and an optical divider which are connected mutually. The optical divider comprises a first-grade optical divider. The OLT link module further comprises a signal combiner, an output end of which is connected with the OLT, and a plurality of first wavelength division multiplexers in one-to-one correspondence with output ends of the first-grade optical divider. Input ends of all first wavelength division multiplexer are in one-to-one correspondence connection with the output ends of the first-grade optical divider. Output ends of all first wavelength division multiplexers are connected with an input end of the signal combiner. The invention further discloses a passive optical network with the OLT link module. The invention can be applicable to an optical network.
Description
Technical field
The present invention relates to fiber optic network, the OLT (optical line terminal, optical fiber cable termination equipment) that especially relates to passive optical-fiber network is to the link between the first order optical branching device.
Background technology
The Internet is just experiencing earth-shaking variation in the world wide.The quick growth of wide band access user has proposed huge bandwidth requirement to optical-fiber network.Have only optical fiber is directly moved in the user family, the user directly surfs the Net by optical fiber, and the user could realize that real network high-speed connects.Therefore a lot of countries in the world all Fiber to the home greatly developing.
Fiber to the home now, and network mainly adopts dual mode: GPON (Gigabit-Capable PON, 1000 M passive fiber optic network) and EPON (Ethernet Passive Optical Network, Ethernet passive optical-fiber network).The access way that other are also arranged certainly, but current GPON and EPON are the networking modes that is widely adopted most.In fiber-to-the-home link design, will consider several aspects usually: one is network extensibility, and second is the cost of network.The optical loss redundancy that very important index is exactly a network is considered in design about these two aspects.Redundancy is big more, and the expansion of future network is easy more, but cost is high more; Redundancy is more little, and cost is low more, but extension of network is just difficult relatively.
The structure of existing PON (Passive Optical Network, passive optical-fiber network) as shown in Figure 7.CATV transmitter, wavelength division multiplexer, optical branching device, ONU (Optical Network Unit, optical node) connect successively, simultaneously, OLT (optical line terminal, optical fiber cable termination equipment) being connected with wavelength division multiplexer, is the single fiber bi-directional modular structure of a standard.Optical branching device can be connected in sequence by multistage optical branching device, and in this concrete structure, optical branching device is made of 1x4 optical branching device and 1xN optical branching device.The 1490nm signal of CATV transmitter emission 1550nm signal, OLT emission comes downwards to ONU through wavelength division multiplexer, 1x4 optical branching device and 1xN optical branching device successively.The 1310nm signal of ONU emission goes upward to OLT through 1xN optical branching device, 1x4 optical branching device and wavelength division multiplexer successively.Certainly, do not have CATV 1550nm signal in some network, at this moment the network configuration the inside does not need 1310,1490/1550 wavelength division multiplex devices yet.
No matter be the sort of access way, when carrying out link design, all will think over the power budget problem.Usually the very important part of PON the inside power budget is up flashlight (such as 1310nm, also can be other wavelength according to the design difference).1310nm optical signals ONU (Optical Network Unit, optical node) end sends, arrive OLT (optical line terminal through the Access Network link, optical fiber cable termination equipment) before the receiver, optical power loss mainly comes from the loss that light junction loss between optical branching device loss, the circuit and transmission range are brought.Wherein, the optical branching device loss table of comparisons is as follows:
This table has been described the loss that optical branching device produces, if add the loss (this is relevant with the quality in the work progress) that wire jumper connects and Optical Fiber Transmission itself produces in the link, in some concrete network planning, various losses may be bigger, the redundancy of leaving network design for will be very little or not enough fully, then extension of network and economy balance brought difficulty.Because the ONU end is very sensitive to price factor, and the transmitting power of 1310nm laser is generally lower, therefore when the 1310nm flashlight arrives OLT, signal light power will be reduced to very low level simultaneously.As seen, the existing passive fiber optic network is because upward signal need could arrive OLT by optical branching devices at different levels, and optical loss is bigger.
Summary of the invention
Because upward signal need could arrive OLT by optical branching devices at different levels, the technical problem that optical loss is bigger provides a kind of OLT link module and passive optical-fiber network in order to solve the prior art passive optical-fiber network in the present invention.
For solving the problems of the technologies described above, the technical solution used in the present invention is a kind of OLT link module of design, comprise interconnective OLT and optical branching device, described optical branching device comprises first order optical branching device, the output that described OLT link module also comprises signal bundling device that an output is connected with OLT and some and described first order optical branching device is first wavelength division multiplexer one to one, and the input of each first wavelength division multiplexer and the output of described first order optical branching device connect one to one, and an output of each first wavelength division multiplexer all is connected with the input of described signal bundling device.
Described optical branching device also comprises one second optical branching device, and another output of each first wavelength division multiplexer is connected with the input of second level optical branching device.
Described OLT has an input and an output, and its input links to each other with the output of described signal bundling device, and its output links to each other with the input of described first order optical branching device.
Described OLT has the shared output of input and output, described OLT link module comprises that also one is connected second wavelength division multiplexer between OLT and first order splitter and the signal bundling device, and its input is connected with the output of described signal bundling device, the one output is connected with the input of described first order optical branching device, and its another output is connected with the output of described OLT.
Be connected by doubly clad optical fiber between described OLT and second wavelength division multiplexer.
Described OLT comprises a light splitting piece, be positioned at the signal emitting laser of light splitting piece first end and be positioned at the signal pick-up probe of light splitting piece second end, and described doubly clad optical fiber is connected the 3rd end of described light splitting piece.
What the output of described signal bundling device connected is multimode fiber.
The invention also discloses a kind of passive optical-fiber network with above-mentioned OLT link module.
Described passive optical-fiber network also comprises a CATV transmitter that is connected with another input of described first order optical branching device.
Described passive optical-fiber network also comprises the optical node that is connected with the output of described optical branching device.
The present invention makes upward signal no longer by first order optical branching device, and directly arrives OLT by first wavelength division multiplexer and signal bundling device, thereby reduced the loss of upward signal by the signalization bundling device.
Description of drawings
The present invention is described in detail below in conjunction with embodiment and accompanying drawing, wherein:
Fig. 1 is embodiment one schematic diagram of passive optical-fiber network of the present invention;
Fig. 2 implements a concrete enforcement figure of one;
Fig. 3 is embodiment two schematic diagrams of passive optical-fiber network of the present invention;
Fig. 4 is the concrete enforcement figure of embodiment two;
Fig. 5 is the structure chart of the doubly clad optical fiber of embodiment two;
Fig. 6 is the OLT structure principle chart of embodiment two;
Fig. 7 is the schematic diagram of prior art passive optical-fiber network.
Embodiment
Embodiment one
See also Fig. 1.PON of the present invention (Passive Optical Network, passive optical-fiber network) comprises CATV transmitter, OLT (optical line terminal, optical fiber cable termination equipment), signal bundling device, first order optical branching device, first wavelength division multiplexer, second level optical branching device and ONU.Wherein, the first order optical branching device and second optical branching device constitute optical branching device, and OLT, optical branching device and signal bundling device constitute the OLT link module.
The CATV transmitter is mainly used in and transmits, and its output links to each other with an input of first order optical branching device.
OLT has an input and an output, and its input links to each other with the output of described signal bundling device, and its output links to each other with the input of described first order optical branching device.At this moment, the emission of OLT and acceptance part will be divided into two independent parts, become the transceiver structure, be different from the single fiber bi-directional modular structure of prior art standard.
The signal bundling device is mainly used in many monomode fibers is closed the Shu Chengyi root multimode fiber, and its output is connected with the input of OLT, and its input is connected with an output of each first wavelength division multiplexer.
First order optical branching device is mainly used in the conversion that realizes signal, as with 1 the road or the multichannel input signal convert multichannel or 1 tunnel output etc. to.One input of first order optical branching device links to each other with the output of CATV, another input links to each other with the output of OLT, (N is the integer more than or equal to 2 to some outputs of first order light path device with first wavelength division multiplexer, 1 to first wavelength division multiplexer N respectively, and equal the number of the output of first order light path device) input link to each other, the output with described first order optical branching device is corresponding one by one respectively for first wavelength division multiplexer, 1 to first wavelength division multiplexer N, and an output of each first wavelength division multiplexer all is connected with the input of described signal bundling device.
First wavelength division multiplexer adopts wavelength-division multiplex technique, is used for realizing that same optical fiber allows two or more optical wavelength signals transmit information separately by different optical channels simultaneously.
The input of second optical branching device is connected with another output of each first wavelength division multiplexer, and the output of second optical branching device links to each other with ONU.
During use, the signal of CATV transmitter emission comes downwards to ONU through first order optical branching device, first wavelength division multiplexer and second level optical branching device, the signal of OLT emission comes downwards to ONU through first order optical branching device, first wavelength division multiplexer and second level optical branching device, simultaneously, the upward signal of ONU goes upward to OLT through second level optical branching device, first wavelength division multiplexer, signal bundling device.By the signalization bundling device, make upward signal no longer by first order optical branching device, and directly arrive OLT by first wavelength division multiplexer and signal bundling device, because the optical loss of signal bundling device is less than optical branching device, thereby reduced the loss of upward signal.
Certainly, optical branching device can also be included under second optical branching device the 3rd optical branching device even the more multistage optical branching device that is provided with, and the output of optical branching device is connected with ONU and gets final product.The present invention does not limit the progression of optical branching device.Certainly, some network does not need the CATV transmitter, at this moment, does not need to be provided with the CATV transmitter.
See also Fig. 2.
This concrete enforcement among figure, be connected by multimode fiber between signal bundling device and the OLT, connect by monomode fiber between all the other devices.The CATV transmitter is a 1550nm signal transmitter, first order optical branching device is a 2x4 optical branching device, second level optical branching device is a 1xN optical branching device, the signal bundling device is a 4x1 signal bundling device, first wavelength division multiplexer (WDM) is 1310,1490/1550WDM, the upward signal that ONU sends is the 1310nm signal, what OLT launched is the 1490nm signal.
The 1310nm upward signal that ONU sends will arrive the input of OLT by 1xN optical branching device, first wavelength division multiplexer and 4x1 signal bundling device.Owing to walk around the 2x4splitter optical branching device, by the input receiving port of 4x1 signal bundling device arrival OLT, its loss can drop to 0.5dB (loss of 4x1 signal bundling device) from original 7.5dB (loss of 2x4 optical branching device).Owing to uploading link, 1310nm increased by one 1310 simultaneously, 1490/1550WDM, and the loss that can bring 0.5dB, therefore, the newly-designed structure of Fig. 2 is adopted in whole consideration, and the 1310nm signal is uploaded the optical loss redundancy has just increased 5.5dB.
The transmission range of 1310nm signal in multimode fiber among the present invention, relevant with the signal transmission rate of the characteristic of multimode fiber and 1310.
Certainly, do not have the CATV transmitter signal in some network, the 2x4 optical branching device can be replaced with the 1x4 optical branching device.In addition, the 1x4or2x4 splitter also can be according to different 1xN or the 2xN splitters of adopting of network.4x1 signal bundling device also can use Nx1 (N is the integer more than or equal to 2) signal bundling device to replace.
Embodiment two
See also Fig. 3.The difference of present embodiment and embodiment one is: OLT only has an output, all shared this output of input and output, OLT does not directly link to each other with first order optical branching device with the signal bundling device, and between OLT and signal bundling device and first order optical branching device one second wavelength division multiplexer is set.The input of second wavelength division multiplexer is connected with the output of described signal bundling device, and the one output is connected with the input of described first order optical branching device, and its another output is connected with the output of described OLT.Simultaneously, be connected by dual mode optical fiber between signal bundling device and second wavelength division multiplexer, be connected by doubly clad optical fiber between OLT and second wavelength division multiplexer.
During use, the signal of CATV transmitter emission comes downwards to ONU through first order optical branching device, first wavelength division multiplexer and second level optical branching device, the signal of OLT emission comes downwards to ONU through second wavelength division multiplexer, first order optical branching device, first wavelength division multiplexer and second level optical branching device, simultaneously, the upward signal of ONU goes upward to OLT through second level optical branching device, first wavelength division multiplexer, signal bundling device and second wavelength division multiplexer.By the signalization bundling device, make upward signal no longer by first order optical branching device, and directly arrive OLT by first wavelength division multiplexer, signal bundling device and second wavelength division multiplexer, because the optical loss of signal bundling device is less than optical branching device, thereby reduced the loss of upward signal.
Certainly, optical branching device can also be included under second optical branching device the 3rd optical branching device even the more multistage optical branching device that is provided with, and the output of optical branching device is connected with ONU and gets final product.The present invention does not limit the progression of optical branching device.Certainly, some network does not need the CATV transmitter, at this moment, does not need to be provided with the CATV transmitter.
Owing to added a wavelength division multiplexer, increased the loss of light at this wavelength division multiplexer place, therefore, the loss redundancy ratio embodiment one of upward signal decreases.
See also Fig. 4.This concrete enforcement among figure, be connected by dual mode optical fiber between signal bundling device and second wavelength division multiplexer, be connected by doubly clad optical fiber between OLT and second wavelength division multiplexer, connect by monomode fiber between all the other devices.The CATV transmitter is a 1550nm signal transmitter, first order optical branching device is a 2x4 optical branching device, second level optical branching device is a 1xN optical branching device, the signal bundling device is a 4x1 signal bundling device, first wavelength division multiplexer (WDM) is 1310,1490/1550WDM, and second wavelength division multiplexer (WDM) is 1310/1490WDM, the upward signal that ONU sends is the 1310nm signal, and what OLT launched is the 1490nm signal.
The 1310nm upward signal that ONU sends will be by 1xN optical branching device, 1310, and 1490/1550WDM, 4x1 signal bundling device and 1310/1490WDM arrive the input of OLT.Owing to walk around the 2x4splitter optical branching device, by the input receiving port of 4x1 signal bundling device and 1310/1490WDM arrival OLT, its loss can drop to 0.5dB (loss of 4x1 signal bundling device) from original 7.5dB (loss of 2x4 optical branching device).Owing to uploading link, 1310nm increased by one 1310,1490/1550WDM and a 1310/1490WDM, the loss that can bring 0.5dB respectively simultaneously, therefore, the newly-designed structure of Fig. 4 is adopted in whole consideration, and the 1310nm signal is uploaded the optical loss redundancy has just increased 5dB.
Certainly, do not have the CATV transmitter signal in some network, the 2x4 optical branching device can be replaced with the 1x4 optical branching device.In addition, the 1x4or2x4 splitter also can be according to different 1xN or the 2xN splitters of adopting of network.4x1 signal bundling device also can use Nx1 (N is the integer more than or equal to 2) signal bundling device to replace.
See also Fig. 5, this figure has disclosed the structure of doubly clad optical fiber, and it is followed successively by fibre core 1, first covering 2, second covering 3 and coat 4 from inside to outside.Doubly clad optical fiber can close ripple to an optical fiber with the signal that transmits in the signal that transmits and the monomode fiber in multimode fiber, doubly clad optical fiber is connected with the OLT output optical fibre.
In Fig. 4, the fibre core of doubly clad optical fiber can transmit the single-mode optics signal, with the optical fiber coupling of transmission 1490nm signal, is used for receiving by the 1490nm single mode signal; Part (inner cladding contains fibre core) is mated with the multimode fiber of transmission 1310 signals in first cladding diameter, is used to receive the 1310nm signal that transmits by multimode fiber; The second cladding diameter 125um or other numerical value, it is a glass structure, convenient and general single mode fiber mates; The overlay diameter is 250um.
See also Fig. 6.This figure has disclosed the structural principle of OLT, and wherein, OLT comprises light splitting piece 61, be positioned at the signal emitting laser 62 of light splitting piece first end and be positioned at the signal pick-up probe 63 of light splitting piece second end, and doubly clad optical fiber is connected the 3rd end 64 of described light splitting piece.
The signal of signal emitting laser 62 emission enters the fibre core of doubly clad optical fiber by light splitting piece 61, and the upward signal that ONU sends enters into the light splitting piece of OLT by first covering of doubly clad optical fiber, reflects entering signal pick-up probe 63 then.
OLT among Fig. 6 also can be used in general PON system the inside, reason be doubly clad optical fiber when using in this case and general single mode fiber mate fully.Therefore the design of this OLT can be suitable for existing network, has increased its versatility.
Signal bundling device of the present invention can be Nx1 signal bundling device (N is the integer more than or equal to 2), and N is big more, and the optical loss redundancy that can provide is big more.Such as can making 8x1 signal bundling device, itself loss can be controlled at below the 1dB, can improve and upload loss of signal redundancy 9～10dB.
The present invention closes ripple by upward signal being used the signal bundling device, reduces the optical loss of upward signal, makes the optical loss of network link itself be reduced, the relation of coming balancing network autgmentability and cost for the bigger space of network designer.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. OLT link module, comprise interconnective OLT and optical branching device, described optical branching device comprises first order optical branching device, it is characterized in that: the output that described OLT link module also comprises signal bundling device that an output is connected with OLT and some and described first order optical branching device is first wavelength division multiplexer one to one, and the input of each first wavelength division multiplexer and the output of described first order optical branching device connect one to one, and an output of each first wavelength division multiplexer all is connected with the input of described signal bundling device.
2. OLT link module according to claim 1 is characterized in that: described optical branching device also comprises one second optical branching device, and another output of each first wavelength division multiplexer is connected with the input of second level optical branching device.
3. OLT link module according to claim 1 is characterized in that: described OLT has an input and an output, and its input links to each other with the output of described signal bundling device, and its output links to each other with the input of described first order optical branching device.
4. OLT link module according to claim 1, it is characterized in that: described OLT has the shared output of input and output, described OLT link module comprises that also one is connected second wavelength division multiplexer between OLT and first order splitter and the signal bundling device, and its input is connected with the output of described signal bundling device, the one output is connected with the input of described first order optical branching device, and its another output is connected with the output of described OLT.
5. OLT link module according to claim 4 is characterized in that: be connected by doubly clad optical fiber between described OLT and second wavelength division multiplexer.
6. OLT link module according to claim 5, it is characterized in that: described OLT comprises a light splitting piece, be positioned at the signal emitting laser of light splitting piece first end and be positioned at the signal pick-up probe of light splitting piece second end, and described doubly clad optical fiber is connected the 3rd end of described light splitting piece.
7. OLT link module according to claim 1 is characterized in that: what the output of described signal bundling device connected is multimode fiber.
8. passive optical-fiber network, it is characterized in that: described passive optical-fiber network has each described OLT link module of claim 1 to 6.
9. passive optical-fiber network according to claim 8 is characterized in that: described passive optical-fiber network also comprises a CATV transmitter that is connected with another input of described first order optical branching device.
10. passive optical-fiber network according to claim 8 is characterized in that: described passive optical-fiber network also comprises the optical node that is connected with the output of described optical branching device.
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Application publication date: 20111207 |